Alexander Leidinger via Postfix-users <postfix-users@postfix.org>
writes:

> Am 2023-12-01 12:08, schrieb Byung-Hee HWANG via Postfix-users:
>>> ...
>>> Nov 30 11:31:48 mailgate postfix/tlsproxy[175]: server certificate
>>> verification failed for in-8.smtp.github.com[140.82.114.32]:25:
>>> num=62:hostname mismatch
>>> ...
>> Maybe you check?
>> <quote from my configuration>
>> root@yw-1204:/etc/postfix# postconf -n | grep CAfile
>> smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
>> smtpd_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
>> </quote>
>
> # postconf -n | grep tls_CA
> smtp_tls_CApath = /etc/ssl/certs
> smtpd_tls_CApath = /etc/ssl/certs
>

My test logshot:
<quote from my log>
Dec  1 11:33:07 yw-1204 postfix/pickup[57397]: 7AB329A3: uid=1000 
from=<soyeo...@yw-1204.doraji.xyz>
Dec  1 11:33:07 yw-1204 postfix/cleanup[59196]: 7AB329A3: 
message-id=<20231201113307.7ab32...@yw-1204.doraji.xyz>
Dec  1 11:33:07 yw-1204 opendkim[637]: RFC2822-From: Byung-Hee HWANG 
<soyeo...@yw.doraji.xyz>
Dec  1 11:33:07 yw-1204 opendkim[637]: RFC2821-From: soyeo...@yw.doraji.xyz
Dec  1 11:33:07 yw-1204 opendkim[637]: RFC2821-To: devn...@reply.github.com
Dec  1 11:33:07 yw-1204 opendkim[637]: 7AB329A3: DKIM-Signature field added 
(s=yw-1204-doraji-xyz, d=doraji.xyz)
Dec  1 11:33:07 yw-1204 postfix/qmgr[54966]: 7AB329A3: 
from=<soyeo...@yw.doraji.xyz>, size=394, nrcpt=1 (queue active)
Dec  1 11:33:08 yw-1204 postfix/smtp[59204]: Trusted TLS connection established 
to in-5.smtp.github.com[140.82.113.31]:25: TLSv1.3 with cipher 
TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature 
RSA-PSS (2048 bits) server-digest SHA256
Dec  1 11:33:09 yw-1204 postfix/smtp[59204]: 7AB329A3: 
to=<devn...@reply.github.com>, relay=in-5.smtp.github.com[140.82.113.31]:25, 
delay=1.6, delays=0.01/0.01/1.2/0.34, dsn=2.0.0, status=sent (250 2.0.0 Ok: 
queued as BE91F5E034E)
Dec  1 11:33:09 yw-1204 postfix/qmgr[54966]: 7AB329A3: removed
</quote>

Actually i have no problem. So Again you need to do double check CAfile
things in main.cf ;;;


Sincerely, Byung-Hee

-- 
^고맙습니다 _布德天下_ 감사합니다_^))//
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